linux-kernel - Re: [PATCH 02/17] [RESEND] irq_work: consolidate arch_irq_work

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Date:   Sat, 12 Aug 2023 09:34:34 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Masahiro Yamada" <masahiroy@...nel.org>,
        "Arnd Bergmann" <arnd@...nel.org>
Cc:     "Andrew Morton" <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        "Catalin Marinas" <catalin.marinas@....com>,
        "Palmer Dabbelt" <palmer@...osinc.com>, guoren <guoren@...nel.org>,
        "Alexander Gordeev" <agordeev@...ux.ibm.com>,
        "Russell King" <linux@...linux.org.uk>,
        "Will Deacon" <will@...nel.org>,
        "Michael Ellerman" <mpe@...erman.id.au>,
        "Nicholas Piggin" <npiggin@...il.com>,
        "Christophe Leroy" <christophe.leroy@...roup.eu>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        "Albert Ou" <aou@...s.berkeley.edu>,
        "Heiko Carstens" <hca@...ux.ibm.com>,
        "Vasily Gorbik" <gor@...ux.ibm.com>,
        "Christian Borntraeger" <borntraeger@...ux.ibm.com>,
        "Sven Schnelle" <svens@...ux.ibm.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "Dave Hansen" <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel@...ts.infradead.org,
        "linux-csky@...r.kernel.org" <linux-csky@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH 02/17] [RESEND] irq_work: consolidate arch_irq_work_raise
 prototypes

On Sat, Aug 12, 2023, at 00:10, Masahiro Yamada wrote:
> On Fri, Aug 11, 2023 at 10:00 AM Arnd Bergmann <arnd@...nel.org> wrote:
>>
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> The prototype was hidden on x86, which causes a warning:
>
>
> What do you mean by "hidden on x86"?
>
> arch_irq_work_raise() was declared on 7 architectures,
> including x86.
>

I meant hidden in some configurations. Specifically, x86
only declares the function when it overrides it for
CONFIG_X86_LOCAL_APIC, while without that option the generic
stub still gets compiled but is never declared.

    Arnd